Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a03aa1798e5f62…

MALICIOUS

PDF

82.0 KB Created: 2021-03-22 12:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f5c27b6711f2b24b1d154925896b428c SHA-1: f123beb3e8f98a9b4c9bef467c8c1ec755064506 SHA-256: 50a03aa1798e5f626142fef73a2eb5588d620788cce1e9df45e6dcd60a5f33eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains keywords related to hacking, suggesting a lure to a malicious site. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/wix?keyword=how+to+hack+wolf+online+ios+2019 PDF link annotation
    • http://guketepudepi.iblogger.org/disney_princess_coloring_pages_free_to_print.pdfIn PDF document text
    • http://betmoy56.com/hpi_savage_x_4.6_for_salegsxqe.pdfIn PDF document text
    • http://segwaywheelchair.ru/196980090244q00r.pdfIn PDF document text
    • http://pedrons.space/panasonic_kx-dt343_specifications1uo8d.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/jXvcmMR/9590908435.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/ijnwiij/5915498100.pdfIn PDF document text
    • http://eduha.online/cake_decorating_store_mesa_azssafg.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/ghg4mig/babagilibosew.pdfIn PDF document text
    • http://macsk.space/polk_audio_psw10_10_powered_subwoofer_specsvxzvp.pdfIn PDF document text
    • http://lighttravel-ng.com/hipaa_dispute_letter_templatelp24e.pdfIn PDF document text
    • http://50offshop.pro/simile_in_romeo_and_juliet_act_2w4uob.pdfIn PDF document text
    • http://odemebayisitrafik.com/nodoxuow6y7.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/QyEhj4U/20858896783.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/TxpQubj/alchemy_gothic_puzzles.pdfIn PDF document text
    • http://salonly.xyz/scary_stories_to_tell_in_the_dark_illustrations_changed32rd7.pdfIn PDF document text
    • http://findattime.com/499987614875vjy3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jebokizez/36614593260.pdfIn PDF document text
    • http://rulafiserize.rf.gd/sujabijuwavamakanifisa.pdfIn PDF document text
    • http://nuxidowu.epizy.com/54734281465.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/spotify_premium_pc_gratis_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/golden_gate_bridge_wallpaper_for_android.pdfIn PDF document text
    • http://dazotetitow.epizy.com/african_cattle_breeds.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/complex_and_compound_complex_worksheet.pdfIn PDF document text
    • http://kozolamo.rf.gd/anatomia_movimientos_articulares.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 5472 bytes
SHA-256: 66d11f257b5c5ba6a4de9e63a5fdb3adcc43f0da8d88be7cdf1be92335c308fe
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 11244 bytes
SHA-256: 9441133e24163487c09d30fcfeaa737c691ac9347792e5dbbe057e228273cdcd
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 16160 bytes
SHA-256: 31f54bf1b2a0bd5fcefce680aa7bc0ab7b2c48a0f9a6877104dd616c0c0a5462

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